Singapore GCE N(A)-Level Science (Chemistry, Biology) Practice Questions - Singapore-Cambridge GCE Normal (Academic) Level Science (Chemistry, Biology) Exam

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Fractional distillation is used to separate a mixture of ethanol (boiling point 78 °C) and water (boiling point 100 °C). Which statement correctly describes what happens in the fractionating column?

Ethanol vapor condenses first at the bottom of the column because it has a lower boiling point. Water vapor rises to the top of the column first because it is denser. Repeated condensation and evaporation take place, allowing ethanol vapor to reach the top first. Glass beads in the column absorb all the water molecules chemically.

Correct Answer:

Repeated condensation and evaporation take place, allowing ethanol vapor to reach the top first.

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